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6a537ceef1
We don't need an entirely separate VMObject subclass to influence the location of the physical pages. Instead, we simply allocate enough physically contiguous memory first, and then pass it to the AnonymousVMObject constructor that takes a span of physical pages.
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/USB/USBTransfer.h>
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#include <Kernel/VM/MemoryManager.h>
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namespace Kernel::USB {
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RefPtr<Transfer> Transfer::try_create(Pipe& pipe, u16 len)
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{
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auto vmobject = AnonymousVMObject::try_create_physically_contiguous_with_size(PAGE_SIZE);
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if (!vmobject)
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return nullptr;
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return AK::try_create<Transfer>(pipe, len, *vmobject);
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}
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Transfer::Transfer(Pipe& pipe, u16 len, AnonymousVMObject& vmobject)
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: m_pipe(pipe)
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, m_transfer_data_size(len)
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{
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// Initialize data buffer for transfer
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// This will definitely need to be refactored in the future, I doubt this will scale well...
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m_data_buffer = MemoryManager::the().allocate_kernel_region_with_vmobject(vmobject, PAGE_SIZE, "USB Transfer Buffer", Region::Access::Read | Region::Access::Write);
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}
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Transfer::~Transfer()
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{
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}
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void Transfer::set_setup_packet(const USBRequestData& request)
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{
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// Kind of a nasty hack... Because the kernel isn't in the business
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// of handing out physical pointers that we can directly write to,
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// we set the address of the setup packet to be the first 8 bytes of
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// the data buffer, which we then set to the physical address.
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auto* request_data = reinterpret_cast<USBRequestData*>(buffer().as_ptr());
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request_data->request_type = request.request_type;
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request_data->request = request.request;
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request_data->value = request.value;
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request_data->index = request.index;
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request_data->length = request.length;
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m_request = request;
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}
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}
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